The Lava Inferno, the Sixth Level of the Abyss.
In the world without a sun, dark clouds filled with toxic dust surged over the sanguine sky. Within this plane that had long perished, the sun was extinguished, the stars and moon were without light, leaving only the scarlet of lava.
The world was stale and hot but not dry, with huge hot steam mixed in liquefied metals shooting out from below ground intermittently. They rose into air and compounded with the ever-present toxic clouds before turning into acid rain that could corrode everything as it fell upon the land and subsequently assembling into lakes of concentrated acid that exist for a few hours.
Even so, it was a rare world that, apart from the Nether River, provided water.